Re: two black lines one inch from each other at bottom of...
Common to have deris on the charge corona that is located inside the drum unit. If you take the toner out and remove the one blue screw, the developer unit will pull out (be careful not to spill as the top is open on the developer unit). Make sure the right side door is open and then you can pull the drum unit out.
Check first if there is the line of toner still on the drum where it would match the lines on the paper. If so.... the drum cleaning blade is the culprit. If not, then you would need to remove two screws that hold the main charge unit in place and remove and clean it very thouroughly with canned air. Even small lint or hair can cause fuzzy looking lines.
The maintenance cycle on the developer and drums it 75,000. If you are in that range, it is ready for a PM anyway and the drum cartridge should be completely rebuilt with new parts.
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This was my exact problem. When scanning from the ADF, I had a vertical black line down every page. I cleaned the larger glass surface several times with no effect. Then, I discovered that ADF scans do NOT use the large glass area, but use the smaller, thinner glass area on the left side. It has a piece of thin plastic over the top of the glass. The scanner is fixed and the paper rolls through this area. So, if a speck of dirt is under the thin plastic piece or on top of the glass or on top of the thin plastic, it results in a black line down the whole page. Aha, so now I cleaned the thin plastic (both sides) and the top of the glass under the thin plastic - actually saw the black dot that was causing the problem and voila, problem solved.
Scan a document in 300 dpi in full width. Check where the line appears in the image. For example if the black line appears at vertical position say 1900, then it means the dirt is at 1900/300 i.e., 6.3 inches from left. Clean the area thoroughly. Check if any pin had created a scratch in the glass. At different contrast levels, if the line appears different, it is definitely unclean glass. On the contrary, if the line appears constant at various levels of contrast, then it is possible that scan module is faulty.
You have something on your "**** glass", the narrow piece of glass that the scanner "looks" through during adf use. Get some window cleaner or rubbing alcohol and clean it with a damp cloth. Often, it's correction fluid (Liquid Paper). A little dot is all it takes because the paper is traveling across the dot, effectively drawing a line down the length of the page.
(Please rate this response as I'm trying to obtain the next level.)
Do the lines appear when you place a blank piece of paper on the glass and make a copy??If not then you need to thoroughly clean the **** glass, that is the separate narrow glass to the left of the machine when the top is up.Even a tiny dot of dust will appear as a vertival line on the copy.
Its good you narrowed it down to 2nd side duplex. It has to be dirt on the glass of the scanner. Its possible that dust has gotten into the ccd or camera area. Take a flash light and see if you can see anything stuck which is black on the glass or if it has a scratch on the glass.
If you lift up the lid on your scanning device you will notice a glass strip about 1 inch thick and then the large area of glass used for flatbed scanning. The 1 inch strip is used for ADF scanning. Because your papper is moving across the glass strip, any dot, smudge or scratch will affect your scanning and cause verticial lines down the page. Sometimes the dot is not visible to the eye. Get some glass cleaner that has alcohol in it and thoroughly clean the glass strip and it should solve your problem. If it turns out to be a scratch on the glass then cleaning won't help.
There must be a strip of glass about one inch wide, next to
the large glass. There is the problem !
Clean that strip thourougly. When you use the feeder the pages
are scanned thru the small strip of glass.
In the old days you would have to change the paper in the tray too...
I've been looking online for the glass, and can't locate it. They will charge you a bundle for a piece of glass anyway (I know Konica charges about $50 one).
As to the question of a sensor. If there's no wire on it, there's no sensor. Some manufacturers use a "coating" that goes to a ground wire for anti-static, etc. Most likely, yours doesn't require this.
Also, to prolong the life of the new glass (now don't tell ALL of my secrets) use armor-all, car wax, even pledge (the wood stuff) on a rag and buff the glass. Just a dab will do.